[Accommodation].

Abstract

Based on the literature data and his own findings the author makes an attempt to specify the accommodation mechanism, particularly hyaloid effect on the lens in the course of accommodation. It is believed, and the author presents experimental data in favor of this assumption, that in youth the lens and hyaloid represent a single optic complex. The lens sealed in the cup-like depression of the vitreous body cannot be mobile in relation to the hyaloid and cannot acquire a more convex shape by itself at the height of accommodation. Moreover, experiments have proved that at the height of accommodation, according to many authors' data, the posterior pole of the lens is shifted towards the hyaloid to a distance of 0.16 to 0.27 mm, which the lens surely cannot do by itself. The hyaloid making rotatory movements at the height of accommodation, it is evident that the lens in this case passively follows the hyaloid and acquires an aspherical shape only under its effect. The ciliary belt plays but a secondary role in this process, being just a buffer.